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[CS Technical Interview 2] Operating Systems Made Clear

A course that helps you understand core operating system concepts and practice explaining them verbally in interviews

(4.8) 28 reviews

398 learners

Level Beginner

Course period Unlimited

  • yiyj10305235
Operating System
Operating System
Tech Interview
Tech Interview
computer-science
computer-science
Operating System
Operating System
Tech Interview
Tech Interview
computer-science
computer-science

Reviews from Early Learners

Reviews from Early Learners

4.8

5.0

PrivilegeEscalate

100% enrolled

1. A lecture that shows how much the author has thought and considered from the student's perspective (seems to consider the learner's understanding flow) 2. Various visual materials and examples make it easy to understand 3. When learning knowledge, it mentions and reminds previous content while connecting knowledge. Knowledge connects and the big picture is drawn. 4. The depth of knowledge is not shallow. I'm taking operating systems right after computer architecture, and the synergy is good. 5. It scratches the itch for "why" & "why is it used" questions. ps. Sorry to the author, but... this is a lecture I want to keep to myself.

5.0

바키라

32% enrolled

It's good for establishing operating system theory.

5.0

Jang Jaehoon

55% enrolled

Long ago, when studying for the Information Processing Engineer certification, I memorized this content, but now as a backend developer, I want to deeply understand and work with OS.

What you will gain after the course

  • Understanding Core Operating System Concepts

  • The ability to explain things verbally in technical interviews

  • Practical workbook PDF that prepares you for follow-up questions

말이 트이는 CS 기술면접 소개 포스터

🥲 Have you ever had this experience in an interview?

1. Confusing concepts when answering

❓InterviewerWhat are the characteristics of object-oriented programming?
💬 Candidate The SOLID principles. First, S is..(omitted)...

This is a situation where the characteristics of object-oriented programming (abstraction, encapsulation, inheritance, polymorphism) and
object-oriented design principles (SOLID) are confused.
This can give the impression that the foundational framework of basic concepts is not established.

2. Knowing only What, but unable to explain How / Why

❓Interviewer What are the characteristics of TCP?
💬 Candidate It's a protocol that guarantees reliability.
❓ Interviewer What mechanisms guarantee reliability?
💬 Candidate Uh... well... it makes transmission secure... something like...

You only know the superficial definition and are not prepared to explain the underlying principles.
If the 3-way handshake, sequence numbers, ACK, retransmission, flow control, and congestion control
are not connected as a single flow, you will inevitably get stuck on follow-up questions.

3. Getting stuck on basic questions

❓Interviewer What is HTTP?
💬 Candidate Um... it's for sending and receiving data on the web... something like that...?

It's a concept you're very familiar with, but when you actually try to explain it in one sentence, the words don't come out.
This isn't a lack of knowledge, but rather a lack of experience organizing and articulating it.


Just knowing is not enough. It only becomes true skill when you can articulate it.

🔥 So we structured it this way.

✦ A cut above the rest, premium content for interview preparation

1⃣ CS Notes organized specifically for interview preparation

  • We've compiled and provided as lecture materials the essential concepts and principles you must review before interviews.

  • While building fundamentals, it's structured so you can review it again right before your interview.

  • It's not just a simple summary, but includes diagrams and easy explanations so even non-majors can fully understand.


Computer Architecture Lecture Material Example

2⃣ Appendix｜Interview Practice Materials Provided

  • In interviews, the ability to explain clearly is far more important than simply knowing something.

  • However, organizing and practicing on your own is not easy and can be a tedious task.

  • At the end of the lecture materials, we've included "answering in one or two sentences" training to reduce the effort of organizing.


Database Course Appendix Example

3⃣ Prepare for follow-up questions with Technical Interview Practice Workbook PDFprovided

  • "Will this course alone really be enough for speaking practice?"
    After much consideration,

    I created a Technical Interview Practice Workbook.

  • Designed so you can practice speaking as if in a real interview on your own.

  • You can find detailed information about the workbook structure and how to use it in the workbook introduction video at the beginning of the course.

Operating System Workbook Example

4⃣ A course that keeps growing with a one-time purchase

  • This course is provided with an unlimited enrollment period.

  • The content will continue to expand with new explanations, additional examples, and more.

  • Even if the price increases as content is added, students who have already purchased
    can access all content at no additional cost.

  • It's a CS fundamentals book you can keep coming back to whenever you need it.

💡 Here's how to make the most of this abundant content

1⃣ Download the materials and learn the core concepts while watching the lectures.
2⃣ Take notes on important parts to create your own CS interview notebook.
3⃣ Save it on your phone and review it briefly whenever you have time.

If you have an interview coming up,
and don't have much time → Use the appendix [Interview Practice] in the course materials to quickly sharpen your interview skills.
If you have time → Complete your speaking practice like a real interview with the Technical Interview Practice Workbook.

🎯 Recommended for

Non-majors, job seekers, career changers, and anyone preparing for technical interviews who needs to be able to articulate CS fundamentals verbally

CS majors who need to review

I've studied it before, but
I can't bring myself to reorganize all that CS knowledge again

Don't open those thick textbooks
again.
We'll cover only the essentials clearly.

Non-CS majors who find CS overwhelming

I'm preparing for technical interviews
for the first time and don't know
where to start

By following the roadmap, you can
focus on learning only
the core CS concepts.

Job seekers with no time to spare

I don't have time for that.
I just need to quickly review
only the CS topics that come up in interviews

You can quickly review on your own with
lecture materials and
interview chapters available.

🔥 Reviews from students who experienced it first

A truly helpful course.
Already proven by 3,000+ students.

⭐️⭐️⭐️⭐️⭐️

1. A lecture that shows how much the author has thought and considered from the student's perspective (seems to consider the learner's flow of understanding)
2. Easy to understand with diverse visual materials and examples
3. When learning knowledge, it mentions and recalls previously learned content to connect the knowledge. Knowledge connects and the big picture emerges.
4. The depth of knowledge is not shallow. I'm taking OS right after Computer Architecture, and the synergy is great.
5. Scratches the itch of "why" & "why is it used" questions.
ps. Sorry to the author, but.. this is a lecture I want to keep to myself.

-'Operating Systems' Course Review

⭐️⭐️⭐️⭐️⭐️

Despite the short lecture duration, I really appreciate how you clearly explain only the important parts. Since it was somewhat theory-focused, I didn't expect SQL queries to be covered, but it was great that you showed examples one by one while teaching basic syntax and how to write queries. After that, the coverage of joins, normalization, transactions, indexes and data optimization, and security was excellent. I haven't tried other paid courses yet, but the last lecture appendix titled "Interview Practice" showed actual questions and answers, which was great for self-study and practice. The lecture duration isn't too long if you focus, so I think I'll go through it multiple times. Thank you

-'Database' Course Review

⭐️⭐️⭐️⭐️⭐️

The core content was explained clearly with a logical flow, which helped me quickly review data structures. Thank you for the great lecture.

-'Data Structures' Course Review

⭐️⭐️⭐️⭐️⭐️

Wow... this is really so good...;;;; I need to save up money and buy the entire roadmap.. I'm curious if you're planning to do lectures on Spring as well.. I'll buy it right away..

-Review of 'Java and Object-Oriented Programming'

⭐️⭐️⭐️⭐️⭐️

This is a lecture where you can set aside a day to organize the key concepts of JavaScript all at once! Great for a refresher before interviews👍



-'JavaScript' Course Reviews

⭐️⭐️⭐️⭐️⭐️

As a non-CS major, I was wondering how to study computer architecture and operating systems among CS knowledge in particular, but the appropriate amount of content made it easy to learn without burden, and I loved how it felt like getting tutored by an expert. I'm planning to take the operating systems course as well and I'm looking forward to it. Thank you!

-'Computer Architecture' Course Review

🖐 Hello! Let me introduce myself! 🙇

As someone from a non-CS background, when I first prepared for a developer job, I only focused on algorithms and coding tests.
I gained some confidence and passed most coding tests, but I kept failing at the next hurdle—technical interviews. What was the problem? It was the lack of CS (Computer Science) knowledge.

I understand the thirst for fundamentals (CS knowledge, programming languages, etc.) better than anyone. I dove into countless materials through self-study and built up my own know-how, and now I'm working as a 🧑🏻‍💻 Kakao developer.

Since I was young, I've been more confident than anyone in combining and reorganizing various materials to create 'my own consolidated notes'. This course is that secret notebook containing all that know-how and passion.

🚀 The second course in the CS Series That Makes It Click is Operating Systems.

  • Still confused about the difference between processes and threads?

  • Do you find it difficult to clearly answer which resources among code/data/stack are shared by threads?


📖 Curriculum packed with only the essentials

This is the table of contents and key keywords you will learn in this course.

If there are any unfamiliar keywords, make sure to grasp them firmly this time.

  1. What is an Operating System

    • Definition and functions of operating systems,

      Hardware managed by the operating system


  2. Hardware Execution Process

    • Kernel mode and user mode, interrupts,

      system calls,

      Program execution process

  3. Process

    • Process context and states,

      Process Control Block,

      Threads and Multithreading

  4. CPU Scheduling

    • CPU scheduling performance metrics and various

      CPU scheduling algorithms,

      Context switching

  5. Process Synchronization and Deadlock

    • Race Condition, Critical Section,

      Semaphore, Mutex,

      Deadlock

  6. Memory Management & Virtual Memory

    • RAM, MMU,

      Paging,

      Segmentation, Virtual Memory, Page Replacement Algorithms


  7. File System & Disk Management

    • File protection, file allocation methods,

      Components of hard disk data,

      Disk Scheduling Techniques

  8. [Appendix] Interview Practice

    • Review key concepts once more in Q&A format

✏ Here's what we'll learn

1⃣Understanding Core Operating System Concepts Through Flow

  • Provides an overall flow of how the operating system connects with CPU, memory, and disk

  • Structured for visual understanding step-by-step from process creation to scheduling and memory virtualization

강의 목차

Detailed Course Curriculum

2⃣Complex OS concepts at a glance! Using intuitive diagrams and handwritten notes

  • Complex OS concepts such as user mode/kernel mode, paging, and scheduling are explained step-by-step with intuitive diagrams supplemented by handwritten notes to aid understanding.

  • In particular, it follows the flow of how the CPU and operating system interact to execute programs and handle input/output with detailed diagrams, aiming for complete understanding rather than rote memorization of concepts.

프로그램 명령어를 수행하는 상세한 과정

The detailed process of executing program instructions

3⃣ Complete Dissection of 'Deadlock' with Code and Diagrams! In-Depth Analysis of Core OS Mechanisms

  • It covers in depth process synchronization techniques such as semaphores and mutexes, as well as deadlock occurrence conditions and resolution strategies, through actual code examples and resource allocation graph diagrams.

  • Additionally, from virtual memory operating principles such as paging and segmentation to disk I/O scheduling and file allocation methods, we provide in-depth analysis of complex algorithms and mechanisms with visual materials to deliver essential knowledge needed for interviews and practical work.

세마포어를 통한 크리티컬 섹션 문제의 해결

Solving the Critical Section Problem with Semaphores

프로세스의 상태 전이

Process state transitions

페이징의 주소 변환 기법

Paging Address Translation Technique

파일 할당 방식 도식화 예시

File allocation method diagram example

👀 Course Preview

If the video is frozen, please refresh :)

Explanation of page replacement algorithms in virtual memory

Explanation of disk scheduling techniques

말이트이는 CS 시리즈

Notes Before Enrollment

  • Provided learning material format: PDF

Recommended for
these people

Who is this course right for?

  • A non-CS major who feels lost because they're studying CS for the first time

  • A computer science major who needs to organize CS concepts before a technical interview

  • A job seeker preparing for a career change who has limited time before a technical interview

Need to know before starting?

  • It's even better if you take the [Computer Architecture](free) course from this series first!

Hello
This is

3,788

Learners

170

Reviews

24

Answers

4.9

Rating

7

Courses

Education and Experience

  • Graduate of Seoul National University

  • Current Kakao Server Developer

    Course Introduction I am creating the "Fluent CS" series to help you articulate CS concepts during interviews. Course Philosophy Having started development as a non-computer science major, I understand the importance of CS...

Course Introduction I am creating the "CS for Speaking" series to help you articulate CS concepts during interviews. Course Philosophy Having started development as a non-computer science major, I...

Course Introduction

I am creating the
CS Speaking series to help you articulate CS concepts during interviews.

Teaching Philosophy

I started my development career as a non-CS major and went through a lot of trial and error while personally organizing everything from CS fundamentals to technical interviews. Based on the learning methods and conceptual organization know-how accumulated through that process, I create content that makes core concepts encountered in practice and interviews easy to understand through illustrations.
"I am creating the lectures that I needed back then."

Blog yiyj1030.tistory.com → Running a tech blog that simplifies CS, algorithms, and practical concepts. Contact yiyj1030@gmail.com

Blog

  • yiyj1030.tistory.com
    → Running a tech blog that simplifies and organizes CS, algorithms, and practical concepts

Contact

yiyj1030@gmail.com

Curriculum

All

25 lectures ∙ (3hr 23min)

Course Materials:

Lecture resources
Published: 
Last updated: 

Reviews

All

28 reviews

4.8

28 reviews

  • jinoj0423님의 프로필 이미지
    jinoj0423

    Reviews 1

    ∙

    Average Rating 5.0

    5

    32% enrolled

    Thank you for the great lecture!

    • minsu12555731님의 프로필 이미지
      minsu12555731

      Reviews 4

      ∙

      Average Rating 5.0

      5

      100% enrolled

      The lecture materials were clean, and I liked how the overall approach focused on making only the core points easy to understand.

      • ji042304234380님의 프로필 이미지
        ji042304234380

        Reviews 1

        ∙

        Average Rating 5.0

        5

        32% enrolled

        You deliver only the necessary information concisely and effectively!

        • dswvgw64121524님의 프로필 이미지
          dswvgw64121524

          Reviews 6

          ∙

          Average Rating 5.0

          5

          32% enrolled

          • asd21123님의 프로필 이미지
            asd21123

            Reviews 11

            ∙

            Average Rating 4.5

            5

            32% enrolled

            This is so good

            $29.70

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